The word "acorn duck" is spelled using the International Phonetic Alphabet (IPA) as /ˈeɪkɔːn dʌk/. The first syllable, "a-" is pronounced as the diphthong /eɪ/, while the second syllable, "-corn", is pronounced as /kɔːn/. The final syllable, "-duck", is pronounced as /dʌk/. In terms of meaning, "acorn duck" is not a commonly used term, and may refer to a species of duck that feeds on acorns or resembles an acorn in appearance.